package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Transactional
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
    // 微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Resource
    private WeChatProperties weChatProperties;

    @Resource
    private UserMapper userMapper;

    @Override
    public User login(UserLoginDTO userLoginDTO) {
        // 获取openid
        String openid = getOpenid(userLoginDTO.getCode());

        // 查询指定用户是否为新用户
        User user = userMapper.getByOpenid(openid);

        // 如果是新用户，就自动完成注册
        if (user == null) {
            // 填充数据
            user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();

            // 新增数据
            userMapper.insert(user);
        }

        // 返回这个用户对象
        return user;
    }

    // 获取openid
    public String getOpenid(String code) {
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        // 发起GET请求拿到openid
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        // 解析json响应的对象
        JSONObject jsonObject = JSON.parseObject(json);
        // 获取openid
        String openid = jsonObject.getString("openid");

        return openid;
    }
}
